>>> import tasks
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "tasks/__init__.py", line 33, in <module>
    force=True)
  File "/home/sieben/.local/lib/python2.7/site-packages/celery/app/base.py", line 663, in autodiscover_tasks
    return self._autodiscover_tasks(packages, related_name)
  File "/home/sieben/.local/lib/python2.7/site-packages/celery/app/base.py", line 670, in _autodiscover_tasks
    return self._autodiscover_tasks_from_names(packages, related_name)
  File "/home/sieben/.local/lib/python2.7/site-packages/celery/app/base.py", line 676, in _autodiscover_tasks_from_names
    packages() if callable(packages) else packages, related_name,
  File "/home/sieben/.local/lib/python2.7/site-packages/celery/loaders/base.py", line 223, in autodiscover_tasks
    related_name) if mod)
  File "/home/sieben/.local/lib/python2.7/site-packages/celery/loaders/base.py", line 248, in autodiscover_tasks
    return [find_related_module(pkg, related_name) for pkg in packages]
  File "/home/sieben/.local/lib/python2.7/site-packages/celery/loaders/base.py", line 274, in find_related_module
    return importlib.import_module('{0}.{1}'.format(package, related_name))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "tasks/syn/TD_6TiSCH_SYN_01/tasks.py", line 3, in <module>
    from tasks import manager
ImportError: cannot import name manager